While teaching a class on natural resource policy law, Ed de Steiguer, professor in the School of Natural Resources and the Environment, came across the Wild, Free-Roaming Horses and Burros Act. The more he read, the more intrigued he became. Now, he has written a book, Wild Horses of the West: History and Politics of America's Mustangs, which he will present on March 12 at the Tucson Festival of Books.